Chirping sound from motor!

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by Katoum, Jun 17, 2004.

  1. gefr

    gefr Life is a trip

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    I had a chirping coming from my KLE400 Kawa and turned out to be the advance was too much!!! It sounded as described here, when accelarating... from a stop and when idling!! What do you guys think??
    #61
  2. BDV300

    BDV300 Adventurer

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    Our 2006 950 was chirp free until the first service was performed, now the bird is there. Same chirp description as everyone else. The bike runs awesome though and that's why I don't want to spend the time/effort/money to 'fix' it. Maybe, it's not really broken.

    Did anyone ever figure out what the chirp really was?
    #62
  3. charlie264

    charlie264 Long timer

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    On my XLV750R, one of the pulse coils for the ignition broke and needed rewinding. After that I noticed a chirpy whistle from one of the exhausts. Block one, no chirp! Block the other, canary! Did a compression test and one of the cylinders was down about 10% to the other. So I put it down to a slightly leaky exhaust valve. Never really got to bottom of the chirp, sold the bike with. Fully disclosed of course, which he used to his advantage.
    Charlie.
    950SE
    #63
  4. BDV300

    BDV300 Adventurer

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    Leaky exhaust valve?! They did find that two exhaust valves were out of spec and had to be adjusted. I'm not sure how far out of spec, or what the adjustment involved. The bike now has 750 miles on it, so I HOPE it's not a leaky exhaust valve.
    #64
  5. charlie264

    charlie264 Long timer

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    They are either the right or wrong valves. Out of spec, not sure what you mean? Diameter of the valve shaft and collars can vary. If a valve is not correctly ground in using valve grinding paste, it will either wear in and seat itself correctly or wear unevenly allowing gas to pass. As for KTM’s I don’t know, some engines the valves and seats are replaced at the same time so valves don’t need to be ground in.
    #65
  6. BDV300

    BDV300 Adventurer

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    Out of spec as in the clearances were too tight on 2 of the exhaust valves. The only other task performed (other than the routine 600 mile service stuff) was to set the needles to the richest setting. My bike was VERY lean from the factory.
    #66
  7. Pantah

    Pantah PJ Fan from Boston

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    I think the chirping is common among carburetted twins in cold temps. It's the carbs. My Ducati does it too.

    Ohh...and my KTM's clutch chirps when first engaging in cold temps too. Actually, my KTM makes all kinds of wierd racket. I've been thinking earplugs might be the right solution.
    #67
  8. BDV300

    BDV300 Adventurer

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    I'll go the ear plugs route as soon as I know the thing's not going to chuck a rod through the top of the engine ;-)

    I agree that it's carb related, but don't think it's temp related. I picked up the bike this past Saturday and it was one of the warmest days since we've owned the 950. What a great day for chirping!

    I'm going to pull the top off the air box this weekend and see if I find anything obvious. Still open to other ideas though.
    #68
  9. PowerCell

    PowerCell Manufacture

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    My SE was chirping for the final 20 miles of my last ride. Turned out to be a broken tab on my skidplate. Wish it where something more interesting, as I would have immediately been able to eleminate the clutch and carb theories...
    #69
  10. spafxer

    spafxer Long timer

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    Chirping can come from the rubber caps used to cover the vacuum ports on the intake manifolds. If the caps deteriorated, they act like a reed on a wind instrument. If the chirp goes away on application of full throttle (less vacuum) that's a sure sign of intake track leakage.

    Good Luck.

    jim
    #70
  11. EnduroJoe

    EnduroJoe Adventurer

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    The best I can figure is that it is the front exhaust flange or front mounting bolt. I had the air filter off watching the carb slides flutter and it still sounds like it's coming from down around the front cylinder. The chirp did stop for a littel bit after a crash, I replaced the front exhaust gasket every time I would retighten the gasket the chirp would stop for a littel bit. I tightened the front mounting bolt and the chirp got a higher pitch, so I set it back to its original position.
    It still chirps, and still don't know what it is for shure. It's not the sas reeds, took them off. did valve adj everything looked ok. Water pump seal & impeller look ok. I have heard a few KLRs with a similar chirp. Anyone with FI bikes have it?
    This is what mine sounds like.
    I'll just have to get earplugs.
    #71
  12. cpmodem

    cpmodem Orange Caveman

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    That doesn't sound like the chirp I've heard from the 950's. Your's sounds more like a "squeek" from something loose. Maybe part of the fairing or the exhaust heat shield.
    :ear
    #72
  13. BDV300

    BDV300 Adventurer

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    That's the same noise mine makes. You were loading the engine to get it to do that, right? I've yet to figure mine out but it's time to start taking things apart. Mine has developed a bad habit of stalling right after a hot start (great when you pull out into trafffic and it stalls). The idle hangs a bit as well so it definately needs some attention. Maybe I'll get lucky and find the squeek while I'm looking for the other issues.
    #73
  14. bykpimp

    bykpimp Live and let ride

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    My bike chirps when cold and just fired up. If I cover the screw holes where the db killers go in the Akras with my fingers, the chirp goes away.
    #74
  15. SimplyExploring

    SimplyExploring n00b

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    My 2008 has just developed a chirp. Has anyone ever got to the bottom of this?

    Its never done it before. Its not a whine its not a whistle its a chirp! Its been laid up over winter and first ride out this year it starts chirping!
    #75
  16. KnowFear

    KnowFear Adventurer

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    My '06 chirps. It definitely seems to be clutch related, and only apparent when taking off from a standstill. I think Pyndon has nailed it with his analysis a couple of pages back.
    #76
  17. okeanis1234

    okeanis1234 Been here awhile

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    My 1190 adventure chirps too!!!it has 1800 kms and it started chirping before 500 kms.it seems that 1190 motors have the same issue...:eek1
    #77
  18. alongat

    alongat Long timer

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    My former 2004 950ADV chirped but it had a lot of mileage on it and I wasn't the original owner so as long as nothing broke and it kept running well, I never questioned it. My new 2012 990 R chirps the same way as described in this thread since day one. Have we determined what the cause is?
    #78
  19. Unruled

    Unruled 950S

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    Only now do I see this thread... Mine does it too. I guess it's clutch related as that's a weak spot to begin with, and it's only apparent when riding away. Dropping to idle (clutch engaged), then gunning it results in a lot of drama and a wheelie, but no chirping.
    #79
  20. Defaultgateway

    Defaultgateway Adventurer

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    It is the second throttles. The space between the 2nd throttles and the primary throttle plate confines a volume(so it depends on both, actually), the small opening around idle conditions sets up a helmholtz resonator that in turn sets up a resonance within the throttle body.

    You have no control over the 2nd throttle, it's position is mapped into the ECU firmware. Also, this crappy ethanol fuel adds deposits that change the chirp conditions over time. Because the ECU is changing the 2nd throttle position all the time, and reacting also to water temp, air temp, barometric pressure,rpm, idle conditioning(cold weather start vs. hot etc.) you may hear it sometimes, other times not. There are bad chirps, and chirps that are absolutely harmless, and this one is the later.

    anyhoo, that's my take on it
    #80